Salix, Iowa, sits in USDA hardiness zone 5a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
On paper, cabbage, cranberry, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Salix, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Salix lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Salix — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Salix — the short answer
Salix, Iowa: USDA zone 5a, about 186 days between hard freezes, across 1K acres of city.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 16
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~186
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 1K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 5a is Salix's average, not your lot's — a low corner or a tree line moves it. Against Salix's 186-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Salix
Each reading below is measured for Salix itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSalix runs about 186 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredSalix sits in USDA hardiness zone 5a.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Salix is in
Salix sits in the Western Corn Belt Plains — EPA Level III, inside the wider Great Plains. That is read at Salix's own centroid rather than borrowed from Woodbury County.
What Grows in Salix
Every plant below cleared Salix's own zone 5a and its 186-day season. Each card opens that plant's Iowa profile. How we score.
Is it too late to plant in Salix?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 19; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 16 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 19 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
What's on the federal record near Salix
Closest first, within ~10 miles of Salix. Listing isn't leaking, and distance isn't exposure.
- 087N48W34AD SalixNitrate · 1000 ft
- 087N47W35BCDB 1949Salix 1Nitrate · 1500 ft
- 087N47W35BCDB 1970Salix 2Nitrate · 1600 ft
- WOODBURY COUNTY MAINT SHEDUnderground Storage Tanks · 1900 ft
- ST JOSEPHS SCHOOLUnderground Storage Tanks · 2400 ft
- DARRELS CONOCOUnderground Storage Tanks · 0.5 mi
- SALIX IA TBS 1Brownfields · 0.5 mi
- WESTWOOD COMM SCHOOLUnderground Storage Tanks · 0.6 mi
- BROWER CONSTRUCTION COBrownfields · 1.0 mi
- SALIX GASUnderground Storage Tanks · 2.8 mi
- NEAL ENERGY CENTER SOUTHUnderground Storage Tanks · 3.4 mi
- TRUCKING PROPERTIESUnderground Storage Tanks · 3.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Salix's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Salix.
Sources Checked
within ~10 miles of Salix
Severity Distribution
within ~10 miles of Salix
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Salix, Toxics Release Inventory runs higher than the national average — 29 sites within ~10 miles of Salix. That's not a problem with your land — it's information about it.
Toxics Release Inventory: TRI facilities report annual chemical releases to air, water, and land.
Check prevailing wind direction — downwind parcels face higher exposure than upwind or crosswind locations.
Check your specific parcel in Salix
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Salix average
Your land is one point inside Salix
Everything above resolves to Salix as a whole — one PHZM band and one 28°F frost record, read across 1K acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at city scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Salix Average
Salix Average
- ●USDA Zones 5a, averaged across Salix
- ●One soil character for all of Salix
- ●Frost dates read at Salix's scale: Apr 16 to Oct 19
YOUR Parcel
- ✓Your exact zone, not Salix's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Salix
Pull a site-specific report for your exact address in Salix, Iowa — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Salix averages can't show:
We read public map data around Salix — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Salix average
How we know this about Salix
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Salix’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at city grain anywhere on this page — there is no city-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Salix
When does frost risk typically end in Salix?
The last hard freeze (28°F) in Salix typically lands around Apr 16, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about May 7.
When is the first frost in Salix?
The first hard freeze (28°F) in Salix typically arrives around Oct 19, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 5, so the watching starts about Sep 19 — about 186 days after the spring freeze cleared.
How long is the growing season in Salix?
Measured between 28°F hard freezes, Salix sees about 186 frost-free days — roughly Apr 16 through Oct 19, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 7 to Oct 5, about 151 days.
Is the soil safe to grow vegetables in Salix?
The federal record around Salix is a meaningful one — 210 documented sites, mostly Underground Storage Tanks entries (81), the nearest Nitrate record about 0.2 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Salix?
From about Sep 19 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Oct 19 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Oct 19. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Salix's scale — its 5a band and its 186-day season. Your yard writes its own version of Salix's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Salix’s own scale
6 of the readings below were taken at Salix's own scale — its own ~186-day season between 28°F freezes, the 1,087 acres it covers and 210 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Salix's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Salix's own 28°F hard-freeze dates, about Apr 16 and Oct 19 and the ~186-day span between themNOAA 1991–2020 Climate Normals
- 210 documented contamination sites on the federal record near Salix, the closest Nitrate record about 0.2 miles out from the town centreFederal environmental registers
- Salix's boundary and the 1,087 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~186-day seasonGrowable Ground crop-matching engine
- The ecoregion at Salix's own centroid, the Western Corn Belt PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Salix's 1,087 acres read through its county's SSURGO summaryfrom Woodbury County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Woodbury County
- The growing challenges every Iowa grower plans around — written at state scale, so they stay on the state guidefrom Iowa
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Woodbury County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Salix's 1,087 acreswhy one lot differs from the next →
- Which side of Salix you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,087 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.2 miles out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Salix-wide figureread your own land →
More in Iowa
Growing region
Nearby growing guides